Question: When did Grand Canyon National Park have 4388390 visitors per year?
Paraphrase: Which year did Grand Canyon National Park receive 4388390 visitors ?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q220289 p:P1174 ?s . ?s ps:P1174 ?x filter(contains(?x , '4.38839e+06')) . ?s pq:P585 ?value}